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revert libc changes

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This commit is contained in:
Alex Burka 2016-07-27 13:51:48 -04:00
parent 54ecc210ec
commit 8e7abea93e
1 changed files with 13 additions and 9 deletions
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22
src/doc/book/ffi.md
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@ -461,11 +461,12 @@ global state. In order to access these variables, you declare them in `extern`
blocks with the `static` keyword:
```rust,no_run
use std::os::raw::c_int;
# #![feature(libc)]
extern crate libc;
#[link(name = "readline")]
extern {
static rl_readline_version: c_int;
static rl_readline_version: libc::c_int;
}
fn main() {
@ -479,14 +480,15 @@ interface. To do this, statics can be declared with `mut` so we can mutate
them.
```rust,no_run
# #![feature(libc)]
extern crate libc;
use std::ffi::CString;
use std::os::raw::c_char;
use std::ptr;
#[link(name = "readline")]
extern {
static mut rl_prompt: *const c_char;
static mut rl_prompt: *const libc::c_char;
}
fn main() {
@ -511,13 +513,14 @@ calling foreign functions. Some foreign functions, most notably the Windows API,
conventions. Rust provides a way to tell the compiler which convention to use:
```rust
use std::os::raw::c_int;
# #![feature(libc)]
extern crate libc;
#[cfg(all(target_os = "win32", target_arch = "x86"))]
#[link(name = "kernel32")]
#[allow(non_snake_case)]
extern "stdcall" {
fn SetEnvironmentVariableA(n: *const u8, v: *const u8) -> c_int;
fn SetEnvironmentVariableA(n: *const u8, v: *const u8) -> libc::c_int;
}
# fn main() { }
```
@ -690,11 +693,12 @@ void bar(void *arg);
We can represent this in Rust with the `c_void` type:
```rust
use std::os::raw::c_void;
# #![feature(libc)]
extern crate libc;
extern "C" {
pub fn foo(arg: *mut c_void);
pub fn bar(arg: *mut c_void);
pub fn foo(arg: *mut libc::c_void);
pub fn bar(arg: *mut libc::c_void);
}
# fn main() {}
```